import {memo} from 'react'
function MemoChildB(props) {
  console.log(" MemoChildB render ");
  const r = Math.random()
  return (
    <div>
      子组件ChildMemoB:{props.data.value}|
      渲染标记：{r}
    </div>
  );
}
export default memo(MemoChildB);
